Ok 1 DIY post for likea...
Allotment username is a misnomer
although some years ago it was true, I do know a little about gardening.
Anyway.... try the blind manufacturer via google for your blind brackets or ebay.
Pollyfilla the holes in the wall, sandpaper over when dry. Either take a scrape of paint off the wall with you to the shop to get a match (match pots) or emulsion the whole wall/room in a similar or different colour, it might well be cheaper especially if you can do another room with the same paint.
PM me if you get stuck with anything else.